anactualmess
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Does it gain the protons that come back into the storma via the ATP synthase channel? Does it also accept electrons that come from the electron transport chain?
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macpatgh-Sheldon
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By addition of hydrogen - reduced NADP is called NADPH.
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anactualmess
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(Original post by macpatgh-Sheldon)
By addition of hydrogen - reduced NADP is called NADPH.
Yeah but where does the hydrogen come from?
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iiilly
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It gets the electron released from the oxidation of the substrate of the reaction taking place. (becomes NADPH)
For example in the Kreb's cycle
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macpatgh-Sheldon
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Depends on the context - if referring to photosynthesis, the H comes ultimately from water - photosystem II [PSII] oxidizes water, and photosystem I [PSI] reduces NADP+ to NADPH. Electrons flow from PSII to PSI.

PSII and PSI operate in electrical series to couple oxidation of H2O with reduction of NADP.

In animals, during the pentose phosphate pathway [an alternative to glycolysis that occurs e.g. in the liver and in the mammary gland], glucose 6 phosphate (G6P) is oxidized as NADP+ is reduced to NADPH, so the H comes from G6P [the process involves several steps, of which one intermediary is xylulose phosphate.

Hope this helps!
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